Dynamic modelling and energy performance analysis of an innovative dual-source heat pump system

Grossi, Ilaria; Dongellini, Matteo; Piazzi, Agostino; Morini, Gian Luca

doi:10.1016/j.applthermaleng.2018.07.022

Cited by 57 publications

(21 citation statements)

References 25 publications

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“…Currently, the number of implementations of hybrid systems [28][29][30] and cascade solutions [31,32] is increasing. Grossi et al [33] conducted energy efficiency tests of a Dual-Source Heat Pump system (DSHP) capable of using heat energy from air and soil. Simulation tests show that it is possible to reduce investment costs by reducing the DSHP well area by 15-50% compared to a conventional solution.…”

Section: Introductionmentioning

confidence: 99%

Impact of Compressor Drive System Efficiency on Air Source Heat Pump Performance for Heating Hot Water

Szreder

Miara

2020

Sustainability

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A standard Polish household with a central heating system powered by a solid fuel furnace was chosen as a case study. The modular Air Source Heat Pump (ASHP) was used to heat the hot water outside the heating season. In this article comparative studies of the impact of the compressor drive system used on the energy efficiency of the heat pump have been carried out in operating conditions. The ASHP heating capacity and coefficient of performance (COP) were determined for the outside air temperature in the range from 7 to 22 °C by heating the water in the tank to a temperature above 50 °C. For the case of a fixed speed compressor, average heating capacity in the range 2.7−3.1 kW and COP values in the range 3.2−4.6 depending on the evaporator supply air temperature were obtained. Similarly, for the inverter compressor, the average heating capacity in the range of 2.7−5.1 kW was obtained for the frequency in the range of 30–90 Hz and COP in the range 4.2−5.7, respectively. On cool days, the average heating capacity of the heat pump decreases by 12%. For the simultaneous operation of two compressors with comparable heating capacity, lower COP values were obtained by 20%.

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Section: Introductionmentioning

confidence: 99%

Impact of Compressor Drive System Efficiency on Air Source Heat Pump Performance for Heating Hot Water

Szreder

Miara

2020

Sustainability

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“…Results provided by several studies [15,16] showed that a proper mixture of PCM and soil as grouting material of the GHE was able to smooth the thermal wave generated by the heat pump on the ground, and to enhance its coefficient of performance (COP). Some authors [17,18] have pointed out that, in hybrid systems such as dual source heat pumps (DSHPs), which change between ground and air as heat sources, the use of an air heat exchanger allows a further reduction of the GHE size, lowering the total cost of the GCHP system. Furthermore, DSHPs can be optimised by switching to the more favourable source/sink between the air and ground according to their temperature, achieving higher efficiencies in comparison with ASHPs and GCHPs [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Energy Analysis of a Dual-Source Heat Pump Coupled with Phase Change Materials

Bottarelli

Gallero

2020

Energies

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Installation costs of ground heat exchangers (GHEs) make the technology based on ground-coupled heat pumps (GCHPs) less competitive than air source heat pumps for space heating and cooling in mild climates. A smart solution is the dual source heat pump (DSHP) which switches between the air and ground to reduce frosting issues and save the system against extreme temperatures affecting air-mode. This work analyses the coupling of DSHP with a flat-panel (FP) horizontal GHE (HGHE) and a mixture of sand and phase change materials (PCMs). From numerical simulations and considering the energy demand of a real building in Northern Italy, different combinations of heat pumps (HPs) and trench backfill material were compared. The results show that PCMs always improve the performance of the systems, allowing a further reduction of the size of the geothermal facility. Annual average heat flux at FP is four times higher when coupled with the DSHP system, due to the lower exploitation. Furthermore, the enhanced dual systems are able to perform well during extreme weather conditions for which a sole air source heat pump (ASHP) system would be unable either to work or perform efficiently. Thus, the DSHP and HGHE with PCMs are robust and resilient alternatives for air conditioning.

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“…When the borehole heat exchangers coupled to the GSHP have to be sized, the overall energy demand of the building and the energy profiles for both heating and cooling conditions are the primary input data. There are different methodologies to design a GSHP: (a) The analytical models (e.g., the infinite line or cylindrical source model) [10][11][12], (b) the method based on the g-functions [13][14][15], and (c) numerical models (e.g., [16][17][18]). Depending on the methodology used, the heating/cooling energy demand of the building has to be provided by the following data:…”

Section: Introductionmentioning

confidence: 99%

A European Database of Building Energy Profiles to Support the Design of Ground Source Heat Pumps

et al. 2019

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The design of ground source heat pumps is a fundamental step to ensure the high energy efficiency of heat pump systems throughout their operating years. To enhance the diffusion of ground source heat pump systems, two different tools are developed in the H2020 research project named, “Cheap GSHPs”: A design tool and a decision support system. In both cases, the energy demand of the buildings may not be calculated by the user. The main input data, to evaluate the size of the borehole heat exchangers, is the building energy demand. This paper presents a methodology to correlate energy demand, building typologies, and climatic conditions for different types of residential buildings. Rather than envelope properties, three insulation levels have been considered in different climatic conditions to set up a database of energy profiles. Analyzing European climatic test reference years, 23 locations have been considered. For each location, the overall energy and the mean hourly monthly energy profiles for heating and cooling have been calculated. Pre-calculated profiles are needed to size generation systems and, in particular, ground source heat pumps. For this reason, correlations based on the degree days for heating and cooling demand have been found in order to generalize the results for different buildings. These correlations depend on the Köppen–Geiger climate scale.

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Dynamic modelling and energy performance analysis of an innovative dual-source heat pump system

Cited by 57 publications

References 25 publications

Impact of Compressor Drive System Efficiency on Air Source Heat Pump Performance for Heating Hot Water

Impact of Compressor Drive System Efficiency on Air Source Heat Pump Performance for Heating Hot Water

Energy Analysis of a Dual-Source Heat Pump Coupled with Phase Change Materials

A European Database of Building Energy Profiles to Support the Design of Ground Source Heat Pumps

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